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Abstract:

A tank type vacuum circuit breaker uses a columnar or cylindrical
insulation rod at a connection portion between an operating mechanism
unit and a vacuum valve. The insulation rod is connected to the operating
mechanism unit and the vacuum valve by rod-shaped pins. To prevent the
insulation rod itself from falling, connection is made by shifting phases
of the pins 90 degrees, respectively, each pin being connected to the
operating mechanism unit and the vacuum valve. Accordingly, the falling
of the insulation rod, the use of an insulation support tube and an
insulation support for ensuring mechanical strength, are avoided. Further
fastening of those supports by bolts or the like is not needed. Increases
in the number of components, the size of the shape of assembly members
around the insulation rod, and weight due to such increases, are
prevented.

Claims:

1. A tank type vacuum circuit breaker, wherein an insulation rod of a
cylindrical shape has a hole at each end section thereof; at sections
where said insulation rod is connected to an operating mechanism unit and
a vacuum valve, a connection component for said operating mechanism unit
and a connection component for said vacuum valve are each formed with a
hole, said connection components being connected to said insulation rod;
the connections are made by a rod pin with respect to each hole of said
insulation rod and said connection components; said rod pins are used to
connect said operating mechanism unit and said vaccum valve: said rod
pins are arranged in a state where phases are different 90 degrees on the
connection side to said operating mechanism unit and on the connection
side to said vacuum valve; and a clearance is provided between each hole
of said insulation rod and said pin to be inserted thereto.

2. (canceled)

Description:

TECHNICAL FIELD

[0001] The present invention relates to switchgear for use in electric
power transmission and distribution facilities, reception and
distribution facilities, and the like.

DESCRIPTION OF THE RELATED ART

[0002] High pressure dry air is sealed in a ground tank. A movable side
contact case is supported at one end of the ground tank via an insulation
support tube and an insulation support; a fixed side contact case is
supported at the other end in the ground tank via a support insulator;
and a vacuum interrupter is supported between the contact cases.

[0004] In switchgear, an insulation rod is used as a connection portion
between an operating mechanism unit and a vacuum valve. The insulation
rod has a role which bridges the operating mechanism unit and the vacuum
valve, and the insulation rod is a connection member necessary for
closing or opening a contact in the inside of the vacuum valve in
accordance with an opening or closing command given by the operating
mechanism unit. As disclosed in the related art (see the related art
document), in order to suppress the insulation rod from falling or in
order to ensure mechanical strength, an insulation support tube and an
insulation support are used, and those members are further fastened by
bolts or the like. In this case, the number of components increases, the
shape of an assembly member around the insulation rod also becomes large,
the weight also further increases, and workability becomes bad.

MEANS FOR SOLVING THE PROBLEMS

[0005] An insulation rod in the present invention has a hole at each end
section thereof; at sections where the insulation rod is connected to an
operating mechanism unit and a vacuum valve, a connection component for
the operating mechanism unit and a connection component for the vacuum
valve are each formed with a hole, the connection components being
connected to the insulation rod; connection can be made by a rod pin with
respect to each hole of the insulation rod and the connection components;
the rod pins are used to connect the operating mechanism unit and the
vacuum valve; the rod pins are arranged in a state where phases are
different 90 degrees on the connection side to the operating mechanism
unit and on the connection side to the vacuum valve; and a clearance is
provided between each hole of the insulation rod and the rod pin to be
inserted therein. Furthermore, fiber reinforced plastic (FRP) resin is
used as a material of the insulation rod to satisfy mechanical strength
and to also achieve reduction in weight; and as a result, reduction in
weight of switchgear itself including these portions is achieved.

Advantageous Effect of the Invention

[0006] The present invention is characterized by a structure described in
the means for solving the problems; whereby, the insulation rod portion
is easily configured and has mechanical strength, and reduction in weight
of the whole rod portion can be achieved. Further, the insulation rod is
suppressed from falling by a method of connecting pin sections of the
insulation rod, the method being the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG. 1 is a sectional view of switchgear of the present embodiment;

[0008] FIG. 2 is a front view of an insulation rod of the present
embodiment;

[0009] FIG. 3 is a side view of the insulation rod of the present
embodiment;

[0010] FIG. 4 is a front view of a connection component for an operating
mechanism unit of the present embodiment;

[0011] FIG. 5 is a front view of a connection component for a vacuum valve
of the present embodiment; and

[0012] FIG. 6 is a front view of the insulation rod after connection of
the present embodiment.

MODE FOR CARRYING OUT THE INVENTION

Embodiment 1

[0013] FIG. 1 shows a tank type vacuum circuit breaker in a mode for
carrying out the present invention.

[0014] An electrically grounded pressure tank 6 is installed with a torso
portion 6-A being kept horizontal; and a pair of opening portions 6-B,
6-C are provided on the upper side of the pressure tank 6. Current
transformer mounting portions 6-D, 6-E coaxial with the opening portions
and smaller in diameter than the opening portions, and flanges for
connecting those portions are constituted. A current transformer for
measuring current 7 is mounted outside the current transformer mounting
portion.

[0015] A vacuum valve 8 is placed in the pressure tank 6 via an air gap
formed with respect to the torso portion 6-A. The vacuum valve 8 is
composed of a tubular vacuum vessel 9 made of insulating material such as
ceramics; a fixed conductor 11 which is placed in the vacuum vessel 9,
one end of the fixed conductor 11 being joined to an end plate 10 which
is for airtight sealing a fixed side end section 9-A of the vacuum vessel
9; and a movable conductor 13 which is disposed to be capable of being
connected/disconnected to/from the fixed conductor 11, the other end of
the movable conductor 13 being extended outside the vacuum vessel 9 via a
bellows 12 attached to a movable side end section 9-B of the vacuum
vessel 9. A fixed contact 11-A and a movable contact 13-A are formed at a
portion where the fixed conductor 11 comes into contact with the movable
conductor 13, respectively. The end plate 10, the fixed conductor 11, and
the movable conductor 13 are made of conductive material such as copper
alloy and aluminum alloy; and the inside of the vacuum valve 8 is
airtight held under vacuum.

[0016] Opening and closing means 14 by which the fixed contact 11-A and
the movable contact 13-A are connected/disconnected to be closed/opened
is provided outside the pressure tank 6.

[0017] The opening and closing means 14 is made to move the movable
conductor 13 in a horizontal direction via an operating rod 15 and an
insulation rod 1; and accordingly, the fixed contact 11-A and the movable
contact 13-A are connected/disconnected to be closed/opened. At this
time, the bellows 12 follows the movement of the movable conductor 13;
and therefore, the inside of the vacuum valve 8 is held under vacuum.
Incidentally, the insulation rod 1 is connected while securing an
insulation distance in which the movable conductor 13 can be electrically
insulated from the operating rod 15.

[0018] A fixed side shield 16 and a movable side shield 17 are provided on
both sides of the vacuum valve 8. The fixed side shield 16 is disposed so
as to cover the fixed side end section 9-A of the vacuum valve 8, and is
connected to the end plate 10 on the fixed side. The movable side shield
17 is disposed so as to cover the movable side end section 9-B of the
vacuum valve 8 and an end section of the movable conductor 13, and is
connected to an end plate 18 on the movable side of the vacuum valve 8.
Furthermore, the vacuum valve 8 is supported by a support frame 19
attached in the vicinity of a flange 6-F of the pressure tank 6, an
insulation support member 20, and the fixed side shield 16.

[0019] The shape of the insulation rod is a cylindrical shape having a
hole 1-A in a center portion thereof and through holes 1-B, 1-C each
formed at end sections thereof. The insulation rod 1 is a connection
portion between the operating mechanism unit and the vacuum valve, and
the connection component for the operating mechanism unit 2 to be
connected to the insulation rod 1 is shown in FIG. 4. The connection
component for the operating mechanism unit 2 is formed with a hole 2-A
shown in FIG. 4. Similarly, a connection component for the vacuum valve 3
to be connected to the insulation rod 1 is shown in FIG. 5. The
connection component for the vacuum valve 3 is also formed with a hole
3-A shown in FIG. 5.

[0020] The connection component for the operating mechanism unit 2 and the
connection component for the vacuum valve 3 are produced by being cut
from round material, and each connection component 2 or 3 can be inserted
to the hole 1-A of the center portion of the insulation rod.

[0021] In the case of connection, the connection component for the
operating mechanism unit 2 and the connection component for the vacuum
valve 3 are inserted to the hole 1-A of the insulation rod 1 to connect.
At this time, the position of the hole 2-A of a connection section for
the operating mechanism unit and the position of the hole 3-A of a
connection section for the vacuum valve are arranged so as to coincide
with the holes 1-B, 1-C of the end sections of the insulation rod 1. A
rod pin 4 is disposed at each hole 1-B, 1-C (2-A, 3-A); and accordingly,
the operating mechanism unit and the vacuum valve are connected to the
insulation rod 1 (see FIG. 6).

[0022] At this time, it is characterized in that, the through holes 1-B,
1-C formed at the end sections of the insulation rod 1 are shifted 90
degrees in phase as shown in FIG. 2. Therefore, the rod pins 4 to be
inevitably used for the connection are also arranged in a state where the
phases are different 90 degrees on the connection side to the operating
mechanism unit and on the connection side to the vacuum valve. If, in the
case where the phases of the rod pins 4 to be connected are not shifted
90 degrees, that is, in the case where the rod pins 4 are arranged in
parallel, it is assumed that the insulation rod 1 is fallen by a
clearance between the rod pin 4 and the hole 1-B or 1-C to a direction
being rotated using the rod pin 4 as an axis. However, the phases of the
rod pins 4 are shifted 90 degrees as shown in the embodiment; and
accordingly, even if the rod pin 4 disposed on one side is tried to be
rotated using the rod pin 4 as an axis, the other rod pin 4 is disposed
perpendicularly to the rod pin 4 disposed on one side and therefore the
movement is regulated. As a result, the insulation rod 1 can be
suppressed from falling. Furthermore, the configuration is such that, for
example, a C ring 5 can be used as a retainer of the rod pin 4 and thus
assembly can be easily performed.

Embodiment 2

[0023] FIG. 2 shows a front view of an insulation rod 1 and FIG. 3 shows a
side view of the insulation rod 1. Fiber reinforced plastic (FRP) is used
for the insulation rod 1 as a material; and the shape of the insulation
rod is a cylindrical shape and therefore reduction in weight can be
achieved. Furthermore, connection is made by shifting phases of rod pins
4 disposed as described in Embodiment 1; and accordingly, the insulation
rod 1 can be suppressed from falling. Therefore, a different component
for supporting the insulation rod 1 (corresponding to the support or the
like for supporting the insulation rod described in the related art) is
not needed. With this, fastening members such as a bolt for attaching the
different component are not also needed; and therefore, the number of
components as a whole can be reduced, reduction in weight is achieved,
working hours of an assembly worker can also be reduced, and cost can
also be suppressed.